Update Parse.podspec with a later version of the FacebookSDK

[adamlevy-emjay]

Updating the FacebookSDK to 11.2.1

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [ ] I am creating this PR in reference to an issue.

Issue Description

Related issue: #FILL_THIS_OUT

Approach

TODOs before merging

• [ ] Add tests
• [ ] Add entry to changelog
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)

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[mtrezza]

Kindly let me know when you're confident that it works and I'll start the CI

[adamlevy-emjay]

We are now using a forked version of the ParseSDK with the FacebookSDK updated. Are you sufficient with just a "no issues found on our end?"